<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let num = 21
        let name = '张三'
        console.log(num,name)
        // document.write(name)
        // prompt('输入姓名')
        // let = prompt
        // document.write('刚才输入的姓名')
        let uname = prompt('输入姓名:')
        let sex = prompt('输入性别:')
        let age = prompt('输入年龄:')
        document.write(uname,sex,age)
        let num1 = 10
        let num2 = 20
        let = temp
        temp = num1
        num1 = num2
        num2 = temp
        console.log(num1,num2);
    </script>
</body>
</html>